AA 5585 then DL 5837 at Charlotte
Louisville → Charlotte → Boston
Timetable, Charlotte time
19:21AA 5585 from Louisville at the gate
18:30DL 5837 to Boston leaves the gate
23 h 09 apart on the timetable, overnight
DL 5837 leaves 23 h 09 after AA 5585 arrives on the timetable: more than half a day, so not a connection we count.